z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Object Support
z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Object Support
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Performance considerations z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Object Support SC23-6866-00 |
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For each OSREQ request to OAM by an application program, OAM verifies the collection name supplied by the application. To minimize the time required to verify the collection name, the following recommendation is made: Shared Catalog — Use unshared catalogs
whenever possible to avoid I/O operations to the master and user catalogs.
You can use the AMS ALTER command to set catalog SHAREOPTIONS to (3
3), which defines them as unshared. Alternatively, you can place catalogs
on unshared volumes. For more information on the AMS ALTER command,
see z/OS DFSMS Access Method Services Commands.
Attention: If
you use SHAREOPTIONS option (3 3) and the catalog resides on a shared
device, you must ensure that the catalog is accessed from only one
system, or unpredictable damage to the catalog might occur.
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